[HTML][HTML] CXCL9 is important for recruiting immune T cells into the brain and inducing an accumulation of the T cells to the areas of tachyzoite proliferation to prevent …

E Ochiai, Q Sa, M Brogli, T Kudo, X Wang… - The American journal of …, 2015 - Elsevier
E Ochiai, Q Sa, M Brogli, T Kudo, X Wang, JP Dubey, Y Suzuki
The American journal of pathology, 2015Elsevier
T cells are required to maintain the latency of chronic infection with Toxoplasma gondii in the
brain. Here, we examined the role of non–glutamic acid-leucine-arginine CXC chemokine
CXCL9 for T-cell recruitment to prevent reactivation of infection with T. gondii. Severe
combined immunodeficient (SCID) mice were infected and treated with sulfadiazine to
establish a chronic infection. Immune T cells from infected wild-type mice were transferred
into the SCID mice in combination with treatment with anti-CXCL9 or control sera. Three …
T cells are required to maintain the latency of chronic infection with Toxoplasma gondii in the brain. Here, we examined the role of non–glutamic acid-leucine-arginine CXC chemokine CXCL9 for T-cell recruitment to prevent reactivation of infection with T. gondii. Severe combined immunodeficient (SCID) mice were infected and treated with sulfadiazine to establish a chronic infection. Immune T cells from infected wild-type mice were transferred into the SCID mice in combination with treatment with anti-CXCL9 or control sera. Three days later, sulfadiazine was discontinued to initiate reactivation of infection. Numbers of CD4+ and CD8+ T cells isolated from the brains were markedly less in mice treated with anti-CXCL9 serum than in mice treated with control serum at 3 days after sulfadiazine discontinuation. Amounts of tachyzoite (acute stage form of T. gondii)-specific SAG1 mRNA and numbers of foci associated with tachyzoites were significantly greater in the former than the latter at 5 days after sulfadiazine discontinuation. An accumulation of CD3+ T cells into the areas of tachyzoite growth was significantly less frequent in the SCID mice treated with anti-CXCL9 serum than in mice treated with control serum. These results indicate that CXCL9 is crucial for recruiting immune T cells into the brain and inducing an accumulation of the T cells into the areas where tachyzoites proliferate to prevent reactivation of chronic T. gondii infection.
Elsevier